C + + Primer (fourth edition) after class exercise 4.18

Problem:

Write a program that uses pointers to write a program that uses pointers to set all elements of an int array to 0.

Code:

1#include <iostream>2 3 using namespacestd;4 5 intMain ()6 {7     Constsize_t Size =5;8     intArr[size] = {0,1,2,3,4};9      for(int*pbegin=arr, *pend =arr+size;           Pbegin! = Pend; pbegin++)Ten     { One*pbegin =0; A     } -      for(int*pbegin=arr, *pend =arr+size; Pbegin! = Pend; pbegin++) -     { thecout<<*pbegin<<" "; -     } -     return 0; -}

View Code

Summarize:

(1) using pointers to iterate through an array, using a similar container vector, use an array of out-of-the-end pointers as Sentinels and judge the loop to end.

(2) C + + allows you to calculate an out-of-end pointer to an array or object, but does not allow a dereference of this address.

C + + Primer (fourth edition) after class exercise 4.18